refactor: restructure test suite

- Remove tests/production/ directory (JWT auth, production monitoring, etc.)
- Remove tests/staking/ directory
- Remove tests/services/test_staking_service.py
- Remove tests/phase1/ directory
- Remove tests/load_test.py
- Add tests/verification/ directory with 20+ new test files
- Add tests/load/locustfile.py for load testing
- Add tests/security/test_confidential_transactions.py
- Add tests/integration/test_working_integration.py
- Update docs/ for minimum Python version and paths

tests/verification/test_minimal.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+"""
+Minimal test to debug transaction import
+"""
+
+import json
+import hashlib
+import requests
+
+BASE_URL = "https://aitbc.bubuit.net/rpc"
+CHAIN_ID = "ait-devnet"
+
+def compute_block_hash(height, parent_hash, timestamp):
+    """Compute block hash using the same algorithm as PoA proposer"""
+    payload = f"{CHAIN_ID}|{height}|{parent_hash}|{timestamp}".encode()
+    return "0x" + hashlib.sha256(payload).hexdigest()
+
+def test_minimal():
+    """Test with minimal data"""
+    
+    # Get current head
+    response = requests.get(f"{BASE_URL}/head")
+    head = response.json()
+    
+    # Create a new block
+    height = head["height"] + 1
+    parent_hash = head["hash"]
+    timestamp = "2026-01-29T10:20:00"
+    block_hash = compute_block_hash(height, parent_hash, timestamp)
+    
+    # Test with empty transactions list first
+    test_block = {
+        "height": height,
+        "hash": block_hash,
+        "parent_hash": parent_hash,
+        "proposer": "test-proposer",
+        "timestamp": timestamp,
+        "tx_count": 0,
+        "transactions": []
+    }
+    
+    print("Testing with empty transactions list...")
+    response = requests.post(f"{BASE_URL}/blocks/import", json=test_block)
+    print(f"Status: {response.status_code}")
+    print(f"Response: {response.json()}")
+    
+    if response.status_code == 200:
+        print("\n✅ Empty transactions work!")
+        
+        # Now test with one transaction
+        height = height + 1
+        block_hash = compute_block_hash(height, parent_hash, timestamp)
+        
+        test_block["height"] = height
+        test_block["hash"] = block_hash
+        test_block["tx_count"] = 1
+        test_block["transactions"] = [{"tx_hash": "0xtest", "sender": "0xtest", "recipient": "0xtest", "payload": {}}]
+        
+        print("\nTesting with one transaction...")
+        response = requests.post(f"{BASE_URL}/blocks/import", json=test_block)
+        print(f"Status: {response.status_code}")
+        print(f"Response: {response.json()}")
+
+if __name__ == "__main__":
+    test_minimal()